Frontend Development Interview Checklist & Roadmap 2025

If you're preparing for a frontend developer interview in 2025 or just aiming to solidify your fundamentals, this roadmap is your go-to guide. Here's a detailed checklist covering HTML and CSS essentials you should be confident with.

HTML5 Essentials

• !DOCTYPE and Quirks Mode - Understand how browsers interpret your HTML based on the doctype declaration.
• Block, Inline, and Inline-block Elements - Know the visual behaviors of different element types.
• Tags & Attributes - Learn the usage of common HTML tags and their attributes.
• Meta Tags - Vital for SEO and browser behavior.
• Head & Title - Manage page metadata and title for browser tabs.
• Imports (script, style, fonts) - Efficiently include external files in your projects.
• Headings (H1-H6) - Structure your content with proper heading levels.
• Tables (Modern Accessibility) - Use tables semantically with ARIA roles and scope attributes.
• Anchors & Navigation - Implement navigation with semantic and accessible anchor tags.
• Lists - Create ordered and unordered lists appropriately.
• Forms & Input Types - Use modern input types like datetime-local and color.
• HTML5 APIs - Explore features like Drag & Drop and Geolocation.
• Semantic HTML - Use elements like article tags, aside tags, and more for meaning and accessibility.
• Local & Session Storage - Handle client-side data storage.
• Responsive Images - Use and srcset for device-specific images.

CSS3 Essentials

• Selectors - Learn basic, combinational, and complex selectors for targeting elements.
• Pseudo-selectors - Style elements based on states or structure using :hover, :nth-child(), etc.
• Specificity & Cascade Rules - Understand how styles are prioritized.
• Inheritance - Know which properties are inherited and how to manage them.
• Box Model & Logical Properties - Master margin, border, padding, and content areas.
• Custom Properties (CSS Variables) - Create reusable values with --custom-var.
• Fonts & Typography - Enhance UI with good font choices and spacing.
• Modern Colors - Use LCH and Lab color spaces for better accessibility and color control.
• Positioning - Apply Static, Relative, Absolute, and Sticky positioning techniques.
• Units - Use relative and absolute units like rem, vh, vw effectively.
• Overflow & Scroll Behavior - Control content that exceeds its container.
• Flexbox & Grid - Create flexible and responsive layouts.
• CSS Modules - Scope your CSS to components for cleaner code.
• Responsive Design - Use Media Queries to adapt your design to different devices.
• Animation Basics - Enhance UI with transitions and keyframes.

This roadmap is a powerful tool whether you're a beginner or brushing up before an interview. Master these concepts and you'll be ready to tackle any frontend challenge that comes your way in 2025!

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